LR3/Disco 3
The casing comprises two halves with machined mating faces. When assembled, the cast iron casing halves are sealed
with a thin film of Loctite 5999 sealant and secured together with fourteen bolts. A breather tube is fitted to the casings.
This allows a plastic tube to be fitted and routed to a high point in the engine compartment, preventing the ingress of
water when the vehicle is wading.
The RH casing is fitted with a drain plug. The front differential unit contains approximately 0.7 litre of oil for a dry fill.
The differential is a conventional design using a hypoid gear layout. This employs a hypoid bevel pinion gear and crown
wheel, with the pinion offset above the centre line of the crown wheel. This design allows for a larger pinion gear to be
used, which has the advantages of increased gear strength and reduced operating noise.
The front differential is available in three ratios. V8 and V6 petrol engine vehicles use a front differential with a final drive
ratio of 3.73:1 and TdV6 diesel engine vehicles use a final drive ratio of 3.07:1, for vehicles with manual transmission, and
3.54:1 for vehicles with automatic transmission. Changing the number of teeth between the crown -wheel drive gear and
11
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Cover seal
12
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Roller bearing cup
13
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Bearing preload spacer
14
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Taper roller bearing
15
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Bolt, 10 of
16
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Differential case
17
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Roll pin
18
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Gear and pinion assembly
19
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Taper roller bearing
20
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Roller bearing cup
21
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Shim
22
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Collapsible spacer
23
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Roller bearing cup
24
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Taper roller bearing
25
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Oil seal
26
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Inner deflector
27
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Outer deflector
28
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Flange
29
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Pinion nut retainer
30
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Pinion nut
31
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Mounting bush assembly
32
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Axle mounting bracket
33
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Data label
34
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Breather tube
35
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Cap
36
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Fill plug
37
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Bolt, 3 of
38
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Taper roller bearing
39
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Bearing preload spacer
40
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Roller bearing cup
41
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Thrust washer
42
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Planet gear
43
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Shaft
44
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Sunwheel
45
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Thrust washer
46
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Mounting bush assembly
